1 files changed, 407 insertions, 0 deletions
diff --git a/lib/crypto_backend/crypto_nss.c b/lib/crypto_backend/crypto_nss.c
new file mode 100644
index 0000000..c154812
--- /dev/null
+++ b/lib/crypto_backend/crypto_nss.c
@@ -0,0 +1,407 @@
+/*
+ * NSS crypto backend implementation
+ *
+ * Copyright (C) 2010-2023 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2010-2023 Milan Broz
+ *
+ * This file is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <string.h>
+#include <errno.h>
+#include <nss.h>
+#include <pk11pub.h>
+#include "crypto_backend_internal.h"
+
+#define CONST_CAST(x) (x)(uintptr_t)
+
+static int crypto_backend_initialised = 0;
+static char version[64];
+
+struct hash_alg {
+	const char *name;
+	SECOidTag oid;
+	CK_MECHANISM_TYPE ck_type;
+	int length;
+	unsigned int block_length;
+};
+
+static struct hash_alg hash_algs[] = {
+	{ "sha1",   SEC_OID_SHA1,   CKM_SHA_1_HMAC,  20,  64 },
+	{ "sha256", SEC_OID_SHA256, CKM_SHA256_HMAC, 32,  64 },
+	{ "sha384", SEC_OID_SHA384, CKM_SHA384_HMAC, 48, 128 },
+	{ "sha512", SEC_OID_SHA512, CKM_SHA512_HMAC, 64, 128 },
+//	{ "ripemd160", SEC_OID_RIPEMD160, CKM_RIPEMD160_HMAC, 20, 64 },
+	{ NULL, 0, 0, 0 }
+};
+
+struct crypt_hash {
+	PK11Context *md;
+	const struct hash_alg *hash;
+};
+
+struct crypt_hmac {
+	PK11Context *md;
+	PK11SymKey *key;
+	PK11SlotInfo *slot;
+	const struct hash_alg *hash;
+};
+
+struct crypt_cipher {
+	struct crypt_cipher_kernel ck;
+};
+
+static struct hash_alg *_get_alg(const char *name)
+{
+	int i = 0;
+
+	while (name && hash_algs[i].name) {
+		if (!strcmp(name, hash_algs[i].name))
+			return &hash_algs[i];
+		i++;
+	}
+	return NULL;
+}
+
+int crypt_backend_init(bool fips __attribute__((unused)))
+{
+	int r;
+
+	if (crypto_backend_initialised)
+		return 0;
+
+	if (NSS_NoDB_Init(".") != SECSuccess)
+		return -EINVAL;
+
+#if HAVE_DECL_NSS_GETVERSION
+	r = snprintf(version, sizeof(version), "NSS %s", NSS_GetVersion());
+#else
+	r = snprintf(version, sizeof(version), "NSS");
+#endif
+	if (r < 0 || (size_t)r >= sizeof(version))
+		return -EINVAL;
+
+	crypto_backend_initialised = 1;
+	return 0;
+}
+
+void crypt_backend_destroy(void)
+{
+	crypto_backend_initialised = 0;
+}
+
+uint32_t crypt_backend_flags(void)
+{
+	return 0;
+}
+
+const char *crypt_backend_version(void)
+{
+	return crypto_backend_initialised ? version : "";
+}
+
+/* HASH */
+int crypt_hash_size(const char *name)
+{
+	struct hash_alg *ha = _get_alg(name);
+
+	return ha ? ha->length : -EINVAL;
+}
+
+int crypt_hash_init(struct crypt_hash **ctx, const char *name)
+{
+	struct crypt_hash *h;
+
+	h = malloc(sizeof(*h));
+	if (!h)
+		return -ENOMEM;
+
+	h->hash = _get_alg(name);
+	if (!h->hash) {
+		free(h);
+		return -EINVAL;
+	}
+
+	h->md = PK11_CreateDigestContext(h->hash->oid);
+	if (!h->md) {
+		free(h);
+		return -EINVAL;
+	}
+
+	if (PK11_DigestBegin(h->md) != SECSuccess) {
+		PK11_DestroyContext(h->md, PR_TRUE);
+		free(h);
+		return -EINVAL;
+	}
+
+	*ctx = h;
+	return 0;
+}
+
+static int crypt_hash_restart(struct crypt_hash *ctx)
+{
+	if (PK11_DigestBegin(ctx->md) != SECSuccess)
+		return -EINVAL;
+
+	return 0;
+}
+
+int crypt_hash_write(struct crypt_hash *ctx, const char *buffer, size_t length)
+{
+	if (PK11_DigestOp(ctx->md, CONST_CAST(unsigned char *)buffer, length) != SECSuccess)
+		return -EINVAL;
+
+	return 0;
+}
+
+int crypt_hash_final(struct crypt_hash *ctx, char *buffer, size_t length)
+{
+	unsigned char tmp[64];
+	unsigned int tmp_len;
+
+	if (length > (size_t)ctx->hash->length)
+		return -EINVAL;
+
+	if (PK11_DigestFinal(ctx->md, tmp, &tmp_len, length) != SECSuccess)
+		return -EINVAL;
+
+	memcpy(buffer, tmp, length);
+	crypt_backend_memzero(tmp, sizeof(tmp));
+
+	if (tmp_len < length)
+		return -EINVAL;
+
+	if (crypt_hash_restart(ctx))
+		return -EINVAL;
+
+	return 0;
+}
+
+void crypt_hash_destroy(struct crypt_hash *ctx)
+{
+	PK11_DestroyContext(ctx->md, PR_TRUE);
+	memset(ctx, 0, sizeof(*ctx));
+	free(ctx);
+}
+
+/* HMAC */
+int crypt_hmac_size(const char *name)
+{
+	return crypt_hash_size(name);
+}
+
+int crypt_hmac_init(struct crypt_hmac **ctx, const char *name,
+		    const void *key, size_t key_length)
+{
+	struct crypt_hmac *h;
+	SECItem keyItem;
+	SECItem noParams;
+
+	keyItem.type = siBuffer;
+	keyItem.data = CONST_CAST(unsigned char *)key;
+	keyItem.len = (int)key_length;
+
+	noParams.type = siBuffer;
+	noParams.data = 0;
+	noParams.len = 0;
+
+	h = malloc(sizeof(*h));
+	if (!h)
+		return -ENOMEM;
+	memset(ctx, 0, sizeof(*ctx));
+
+
+	h->hash = _get_alg(name);
+	if (!h->hash)
+		goto err;
+
+	h->slot = PK11_GetInternalKeySlot();
+	if (!h->slot)
+		goto err;
+
+	h->key = PK11_ImportSymKey(h->slot, h->hash->ck_type, PK11_OriginUnwrap,
+				   CKA_SIGN,  &keyItem, NULL);
+	if (!h->key)
+		goto err;
+
+	h->md = PK11_CreateContextBySymKey(h->hash->ck_type, CKA_SIGN, h->key,
+					   &noParams);
+	if (!h->md)
+		goto err;
+
+	if (PK11_DigestBegin(h->md) != SECSuccess)
+		goto err;
+
+	*ctx = h;
+	return 0;
+err:
+	crypt_hmac_destroy(h);
+	return -EINVAL;
+}
+
+static int crypt_hmac_restart(struct crypt_hmac *ctx)
+{
+	if (PK11_DigestBegin(ctx->md) != SECSuccess)
+		return -EINVAL;
+
+	return 0;
+}
+
+int crypt_hmac_write(struct crypt_hmac *ctx, const char *buffer, size_t length)
+{
+	if (PK11_DigestOp(ctx->md, CONST_CAST(unsigned char *)buffer, length) != SECSuccess)
+		return -EINVAL;
+
+	return 0;
+}
+
+int crypt_hmac_final(struct crypt_hmac *ctx, char *buffer, size_t length)
+{
+	unsigned char tmp[64];
+	unsigned int tmp_len;
+
+	if (length > (size_t)ctx->hash->length)
+		return -EINVAL;
+
+	if (PK11_DigestFinal(ctx->md, tmp, &tmp_len, length) != SECSuccess)
+		return -EINVAL;
+
+	memcpy(buffer, tmp, length);
+	crypt_backend_memzero(tmp, sizeof(tmp));
+
+	if (tmp_len < length)
+		return -EINVAL;
+
+	if (crypt_hmac_restart(ctx))
+		return -EINVAL;
+
+	return 0;
+}
+
+void crypt_hmac_destroy(struct crypt_hmac *ctx)
+{
+	if (ctx->key)
+		PK11_FreeSymKey(ctx->key);
+	if (ctx->slot)
+		PK11_FreeSlot(ctx->slot);
+	if (ctx->md)
+		PK11_DestroyContext(ctx->md, PR_TRUE);
+	memset(ctx, 0, sizeof(*ctx));
+	free(ctx);
+}
+
+/* RNG */
+int crypt_backend_rng(char *buffer, size_t length, int quality __attribute__((unused)), int fips)
+{
+	if (fips)
+		return -EINVAL;
+
+	if (PK11_GenerateRandom((unsigned char *)buffer, length) != SECSuccess)
+		return -EINVAL;
+
+	return 0;
+}
+
+/* PBKDF */
+int crypt_pbkdf(const char *kdf, const char *hash,
+		const char *password, size_t password_length,
+		const char *salt, size_t salt_length,
+		char *key, size_t key_length,
+		uint32_t iterations, uint32_t memory, uint32_t parallel)
+{
+	struct hash_alg *ha;
+
+	if (!kdf)
+		return -EINVAL;
+
+	if (!strcmp(kdf, "pbkdf2")) {
+		ha = _get_alg(hash);
+		if (!ha)
+			return -EINVAL;
+
+		return pkcs5_pbkdf2(hash, password, password_length, salt, salt_length,
+				    iterations, key_length, key, ha->block_length);
+	} else if (!strncmp(kdf, "argon2", 6)) {
+		return argon2(kdf, password, password_length, salt, salt_length,
+			      key, key_length, iterations, memory, parallel);
+	}
+
+	return -EINVAL;
+}
+
+/* Block ciphers */
+int crypt_cipher_init(struct crypt_cipher **ctx, const char *name,
+		    const char *mode, const void *key, size_t key_length)
+{
+	struct crypt_cipher *h;
+	int r;
+
+	h = malloc(sizeof(*h));
+	if (!h)
+		return -ENOMEM;
+
+	r = crypt_cipher_init_kernel(&h->ck, name, mode, key, key_length);
+	if (r < 0) {
+		free(h);
+		return r;
+	}
+
+	*ctx = h;
+	return 0;
+}
+
+void crypt_cipher_destroy(struct crypt_cipher *ctx)
+{
+	crypt_cipher_destroy_kernel(&ctx->ck);
+	free(ctx);
+}
+
+int crypt_cipher_encrypt(struct crypt_cipher *ctx,
+			 const char *in, char *out, size_t length,
+			 const char *iv, size_t iv_length)
+{
+	return crypt_cipher_encrypt_kernel(&ctx->ck, in, out, length, iv, iv_length);
+}
+
+int crypt_cipher_decrypt(struct crypt_cipher *ctx,
+			 const char *in, char *out, size_t length,
+			 const char *iv, size_t iv_length)
+{
+	return crypt_cipher_decrypt_kernel(&ctx->ck, in, out, length, iv, iv_length);
+}
+
+bool crypt_cipher_kernel_only(struct crypt_cipher *ctx __attribute__((unused)))
+{
+	return true;
+}
+
+int crypt_bitlk_decrypt_key(const void *key, size_t key_length,
+			    const char *in, char *out, size_t length,
+			    const char *iv, size_t iv_length,
+			    const char *tag, size_t tag_length)
+{
+	return crypt_bitlk_decrypt_key_kernel(key, key_length, in, out, length,
+					      iv, iv_length, tag, tag_length);
+}
+
+int crypt_backend_memeq(const void *m1, const void *m2, size_t n)
+{
+	return NSS_SecureMemcmp(m1, m2, n);
+}
+
+bool crypt_fips_mode(void)
+{
+	return false;
+}